Preliminary
May 23, 2002 Ver. 1-1
Externally Applied Reference Voltage (Vref)
Applications
Ceramic Capacitors Compatible
Power Supply for LCD
Input Voltage Range: 0.9V~10.0V
PDAs
Oscillation Frequency: 300kHz, 100kHz (15%)
Cellular Phones
PWM Control (XC9106)
Palmtop Computers
PWM/PFM Automatic Switching Control (XC9107)
Portable Audio Systems
SOT-25 / USP-6B Package
Various Multi-function Power Supplies
General Description
Features
Input Voltage Range:
0.9V ~ 10.0V
Power Supply Voltage Range:
1.8V ~ 10.0V and more than Vref+0.7V
V
REF
Input Range:
0.8V ~ 2.5V (
2.0%)
Output Voltage:
Vref x external split resistor ratio
V
OUT
=Vref
x (RFB1+RFB2)/RFB2
Oscillation Frequency:
300kHz, 100kHz
15%
Output Current:
more than 30mA
Controls:
PWM (XC9106)
PWM/PFM auto-switching (XC9107)
High Efficiency:
85% (TYP.)
Stand-by Current:
ISTB=1
.
0
A (MAX.)
Load Capacitors:
Low ESR capacitors compatible
Packages:
SOT-25, USP-6B
Typical Application Circuit
Electrical Characteristics
1
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
(V
IN
=3.3V, V
OUT
=20V, when peripheral
components are used as in the circuits
below .)
The XC9106 / 07 series are step-up DC/DC controller ICs with
an externally applied reference voltage (Vref).
Output voltage will be set with external resistors (RFB1 and 2)
and Vref value. The series make it easy to control output
voltage externally and are suited to software applications that
need to vary voltage, such as LCD power supply for PDA.
Output will be stable no matter which load capacitors are used
but if a low ESR capacitor is used, R
SENSE
of about 0.1
will
be required and phase compensation will be achieved. This
makes the use of ceramic capacitors much easier, and allows
for lower output ripple and reduced PCB area requirements.
Tantalum and electrolytic capacitors can also be used, in which
case, R
SENSE
becomes unnecessary.
Oscillation frequencies of high clock, low ripple 300kHz and low
supply current 100kHz are available.
The XC9107 series are PWM/PFM automatic switching
controlled. Control switches from PWM to PFM during light
* R
SENSE
is of no use in light load (uncontinuous mode)
applications such as a small LCD, even using ceramic capacitor.
loads with the XC9107 and the series is highly efficient from
light loads to large output currents. By bringing the whole circuit
down while the series is in the stand-by mode (CE/PWM pin :
low), supply current can be reduced to less than 1.0
A.
0
5
10
15
20
25
30
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Vref (V)
V
OUT
(V)
0
5
10
15
20
25
30
0.1
1
10
100
1000
I
OUT
(mA)
V
OUT
(V)
2.0V
Vref=0.8V
1.5V
2.5V
Circuit as left
V
DD
=V
IN
=3.3V, I
OUT
=30mA
XC9107D003MR
XC9107D003MR
Circuit as left
V
DD
=V
IN
=3.3V
L : 10
H
SD : MA737
CFB : 27pF
Nch Power
MOS FET
2SK2159
V
IN
= 3.3V
RFB2 :
30k
RFB1 :
270k
V
OUT
= 8V~25V
I
OUT
= 30mA
D/A converter
Ceramic CL :
10
F
CE/Vref
CIN
RSENSE : 100m
for Ceramic CL
0.8V~2.5V
3
2
1
5
4
*
Preliminary
Pin Configuration
Pin Assignment
Ordering Information
XC9107 Series: PWM/PFM automatic switching control
XC9106 Series: PWM Control
(Ordering information is the same as XC9106 Series)
Reference Voltage (apply external)
Fixed : 00
Oscillation Frequency: 300kHz
100kHz
Package:
SOT-25 (1 reel = 3000 pcs.)
USP-6B (1 reel = 3000 pcs.)
Embossed Tape:
Standard Feed
Reverse Feed
Block Diagram
Absolute Maximum Ratings
Ta = 25
O
C
2
FUNCTION
Ground
GND
FB
V
DD
mW
O
C
Storage Temperature
RATINGS
UNITS
V
V
-0.3 ~ 12.0
-0.3 ~ 12.0
SOT-25
USP-6B
-0.3 ~ 12.0
V
Tstg
O
C
-55 ~ +125
V
DD
FB
V
CE
/ Vref
-0.3 ~ V
DD
+ 0.3
mA
Topr
V
EXT
I
EXT
/
100
150
100
-40 ~ +85
V
Pd
SYMBOL
R
L
5
M
1
4
D
Supply Voltage
NC
No Connection
3
5
PIN
NAME
XC9107D
12345
Output Resistor Connection
External Transistor Connection
EXT
2
6
2
SOT-25
USP-6B
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
XC9106D
12345
-
5
3
4
4
12
EXT pin Current
Power Dissipation
Externally Applied Reference Voltage (Vref)
Serves as both Chip Enable pin and
Reference Voltage Apply pin.
CE/
Vref
3
3
1
PIN NUMBER
1
Operating Ambient Temperature
PARAMETER
V
DD
pin Voltage
FB pin Voltage
CE / Vref pin Voltage
EXT pin Voltage
SOT-25
(TOP VIEW)
1
2
3
4
5
6
5
4
1
2
3
USP-6B
(TOP VIEW)
Ramp Wave
Generator,
OSC
Current
Ripple Detect
and FB
PWM/PFM
Controller
Phase
Compensation
Vref with
Soft Start,
CE
Buffer,
Driver
Error Amp.
PWM
Comparator
FB
VDD
EXT
GND
CE / Vref
FB, CE : CMOS INPUT
EXT : CMOS OUTPUT
Preliminary
Electrical Characteristics
XC9106D001MR, XC9107D001MR
(FOSC=100 (kHz)
Ta=25
O
C
*1
*1
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.
V
DD
=
(V)
Vref =
(V) ,
RFB1, 2 x 10
V
IN
=
(V)
I
OUT
=
(mA)
Notes
*1
3
V
1
3
V
4
V
-
Oscillation Start Voltage
V
ST2
CE/Vref=0.9V, Voltage applied, FB=0V
V
ST1
Recommended Circuit using 2SD1628, I
OUT
=1.0mA
No external connections
V
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Circuit
-
Externally Applied Reference Voltage (Vref)
8.820 9.000 9.180
0.8
2.5
UNITS
4
A
4
V
3
V
4
V
5
14
19
A
1.0
A
1
%
4
%
4
1
KHz
PARAMETER
Output Voltage
Reference Voltage Range
Operation Start Voltage
FB Control Voltage
Power Supply Voltage Range
Same as I
DD1
Maximum Duty Ratio
PFM Duty Ratio
FOSC
MAXDTY
PFMDTY
Same as I
DD1
Oscillation Frequency
Supply Current 2
Operation Holding Voltage
Supply Current 1
V
FB
V
DD
Vref = 0.9V
VDD as shown right or (Vref applied voltage + 0.7V)
Efficiency
Recommended Circuit using 2SD1628, IOUT=1.0mA
Same as V
ST2
, V
DD
=3.300V
I
STB
V
HLD
I
DD1
I
DD2
Same as I
DD1
, CE/Vref=0V
Same as I
DD1
, FB=1.2V
Stand-by Current
V
No Load (XC9106 series)
Recommended Circuit using XP161A1355
EFFI
%
20
28
36
85
1
Soft-start Time
Vref=0.9V
mS
T
SS
5.0
10.0
20.0
5
V
5
CE "Low" Voltage
V
CEL
Same as I
DD1
CE "High" Voltage
V
CEH
Same as I
DD1
0.20
4
EXT "Low" ON Resistance
R
EXTL
Same as I
DD1
, V
EXT
=V
OUT
-0.4V
EXT "High" ON Resistance
R
EXTH
24
36
4
5
A
Same as I
DD1
, V
EXT
=0.4V
16
24
CE "Low" Current
I
CEL
Same as I
DD2
, CE=2.5V
CE "High" Current
I
CEH
Same as I
DD2
, CE=0V
0.0
A
A
5
2.5
Same as I
DD2
, CE=V
DD
5
-0.1
0.1
5
FB "High" Current
I
FBH
A
Same as I
DD2
, CE=0V
I
FBL
-0.1
1.8
CONDITIONS
Vref = 0.9V
SYMBOL
V
OUT
Vref
MIN.
TYP.
MAX.
0.882 0.900 0.918
0.8
10.0
0.9
0.7
29
41
75
81
87
85
100
115
0.65
FB "Low" Current
0.09
50
Although the IC starts step-up operations from a V
DD
of 0.8V, the output voltage and oscillation frequency are stabilized at
V
DD
1.8V or (Vref applied voltage + 0.7V). Therefore, a V
DD
of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when
V
DD
is supplied from V
IN
or other power sources.
3.30
3.30
Preliminary
Electrical Characteristics
XC9106D003MR, XC9107D003MR
(FOSC=300 (kHz)
Ta=25
O
C
*1
*1
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.
V
DD
=
(V)
Vref =
(V) ,
RFB1, 2 x 10
V
IN
=
(V)
I
OUT
=
(mA)
Notes
*1
Standard Circuit
4
Externally Applied Reference Voltage (Vref)
PARAMETER
SYMBOL
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
CONDITIONS
MIN.
TYP.
MAX.
UNITS
Circuit
Output Voltage
V
OUT
Vref = 0.9V
8.820 9.000 9.180
V
1
Reference Voltage Range
Vref
0.8
2.5
V
-
FB Control Voltage
V
FB
Vref = 0.9V
0.882 0.900 0.918
V
4
Power Supply Voltage Range
V
DD
VDD as shown right or (Vref applied voltage + 0.7V)
1.8
10.0
V
-
Operation Start Voltage
V
ST1
Recommended Circuit using 2SD1628, I
OUT
=1.0mA
0.9
V
3
Oscillation Start Voltage
V
ST2
No external connections
CE/Vref=0.9V, Voltage applied, FB=0V
0.8
V
4
Operation Holding Voltage
V
HLD
Recommended Circuit using 2SD1628, IOUT=1.0mA
0.7
V
3
Supply Current 1
I
DD1
Same as V
ST2
, V
DD
=3.300V
62
88
A
4
Supply Current 2
I
DD2
Same as I
DD1
, FB=1.2V
16
22
A
4
Stand-by Current
I
STB
Same as I
DD1
, CE/Vref=0V
1.0
A
5
Oscillation Frequency
FOSC
Same as I
DD1
255
300
345
KHz
4
Maximum Duty Ratio
MAXDTY Same as I
DD1
75
81
87
%
4
PFM Duty Ratio
PFMDTY No Load (XC9106 series)
24
32
40
%
1
Efficiency
EFFI
Recommended Circuit using XP161A1355
85
%
1
Soft-start Time
T
SS
Vref=0.9V
5.0
10.0
20.0
mS
1
CE "High" Voltage
V
CEH
Same as I
DD1
0.65
V
5
CE "Low" Voltage
V
CEL
Same as I
DD1
0.20
V
5
EXT "High" ON Resistance
R
EXTH
Same as I
DD1
, V
EXT
=V
OUT
-0.4V
24
36
4
EXT "Low" ON Resistance
R
EXTL
Same as I
DD1
, V
EXT
=0.4V
16
24
4
CE "High" Current
I
CEH
Same as I
DD2
, CE=2.5V
0.0
2.5
A
5
CE "Low" Current
I
CEL
Same as I
DD2
, CE=0V
-0.1
A
5
FB "High" Current
I
FBH
Same as I
DD2
, CE=V
DD
0.1
A
5
FB "Low" Current
I
FBL
Same as I
DD2
, CE=0V
-0.1
A
5
3.30
0.09
3.30
50
Although the IC starts step-up operations from a V
DD
of 0.8V, the output voltage and oscillation frequency are stabilized at
V
DD
1.8V or (Vref applied voltage + 0.7V). Therefore, a V
DD
of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when
V
DD
is supplied from V
IN
or other power sources.
When obtaining V
DD
from a source other than V
OUT
, please
insert a capacitor C
DD
between the V
DD
pin and the GND pin in
order to provide stabler operations.
Please wire CL & C
IN
between the V
OUT
/V
DD
pin and the GND
pin. Strengthen the wiring sufficiently. When using a capacitor
other than ceramic or low ESR at CL, please take away
R
SENSE
and short.
Insert Rb and CB when using a
bipolar NPN Transistor.
V
OUT
Nch Power
MOS FET
RSENSE
L
V
IN
SD
R
FB1
R
FB2
C
FB
CE/Vref
1
5
4
3
2
CL
Rb
Cb
Preliminary
Operational Description
<Error Amp.>
<OSC Generator>
<Ramp Wave Generator>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the OSC Generator.
<PWM Comparator>
<PWM/PFM Controler>
<Vref 1 with Soft Start>
TSS = 8.65 x Vref + 2.21
[Example Computation]
Vref = 0.9V, TSS = 8.65 x 0.9 + 2.21 = 10.0 ms
<Enable Function>
5
The XC9106 / 07 series are reference voltage (Vref) apply external step-up DC/DC Controler ICs. Output voltage will be set with external
resistors (RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications
that need to vary voltage such as LCD power supply for PDA.
This function controls the operation and shutdown of the IC. When the voltage of the CE pin drops to 0.2V or less, disable mode will
be entered, the IC's operations will stop and the EXT pin will be kept at a low level (the external N-type MOSFET will be OFF) . When
the IC is in a state of chip disable, current consumption will be no more than 1.0
A.
When the CE pin's voltage rises to 0.65V or more, enable mode will be entered and operations will recommence. The CE pin also
doubles with reference voltage in the XC9106/9107 series, and the range of reference voltage can be varied externally from 0.8V to
2.5V.
The reference voltage of the XC9106/9107 series is adjusted and fixed by external applied voltage. (For output voltage settings, please
refer to the output voltage setting on page 6.)
To protect against inrush current, when the power is switched on, and also to protect against voltage overshoot, soft-start time is set
internally to 10ms. It should be noted, however, that this circuit does not protect the load capacitor (CL) from inrush current. With the Vref
voltage limited, and depending upon the input to error amp, the operation maintains a balance between the two inputs of error amps and
controls the EXT pin's ON time so that it doesn't increase more than is necessary.
The XC9106/9107 series alters soft start times by the setting value of reference voltage in order to protect against voltage overshoot and
also to protect against inrush current. Please determine soft start time by the formula equation.
Error Amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In
response to feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases.
This circuit generates the internal reference clock.
The PWM Comparator compares outputs from the Error Amp. and saw-tooth waveform. When the voltage from the Error Amp's output is
low, the external switch will be set to ON.
This circuit generates PFM pulses.
The PWM/PFM automatic switching mode switches between PWM and PFM automatically depending on the load. As the PFM circuit
generates pulses based on outputs from the PWM Comparator, shifting between modes occurs smoothly. Noise is easily reduced with
PWM control since the switching frequency is fixed. Because of the function, control suited to the application can easily be selected.
Externally Applied Reference Voltage (Vref)
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
XC9106 / XC9107D xxx MR
0
5
10
15
20
25
30
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Reference Voltage Vref (V)
S
o
ft S
t
art T
i
m
e
: T
S
S
(m
s)
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